450 bushmaster build

Hello all , I am building a 450 bushmaster , I’m starting out with an Aero lower with A2 rifle stock setup and a standard A2 buffer and spring , should that suffice or should I use a heavier buffer . Also , I’m thinking of going with a 16 inch barrel , should I use a Carbine length gas tube setup ? Any other things that I need to know ? Thanks for any help .

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